It’s surprising how many enquires we get asking for small beacons that also have a long battery life and long range. Such things don’t exist. Long range and long battery life need more battery power and hence the battery size needs to be larger. This implies a larger beacon.
You need to choose what’s most important for your project. If you need a very small device then the E8 is only 5mm thick but has a small CR2032 battery. If battery life and range are more important then look at the larger battery beacons and long range beacons. If you have the possibility of mains (USB) power then you might consider a USB beacon that can be small.